Fiber core



Oct. 16, 1928.

H. PARKER FIBER CORE Filed April 16, 19 27 v Java %WWQ7 /Z/%/ 6 W M 7 Patented Oct. 1,928.

UNITED STATESPATENT OFFICE.

HOWARD PARKER, 01 BERLIN, NEW HAMPSHIRE, ASSIGNOR 'I'O BROWN CO EPANY,

' OF BERLIN, NEW HAMIPSHIBE, A CORPORATION OF MAINE.

FIBER CORE.

, Application filed April 16, 1927. Serial No. 184,419.

tomarily been made by spirally winding separate strips of paper upon one another with paste between the plies, cutting off suitable lengths of the tube thus formed, and fitting a metal cap on each end of the out. sections, the

metal cap being for the purpose of protecting the ends from injury. Laminated paper cores of this type are relatively soft in texture and must be made with relatively thick walls in order to have s'ufiicient strength for the uses to which they are customarily put. I have found that by making tubular sections of wet pulp by winding a sheet of wet pulp upon itself in convolutions under pressure and drying the tubes so wound, a core can be produced which can be made with walls considerably thinner than those of a laminated paper tube of the same external diameter and of equal strength. Tubes made in this way are comparatively hard, rigid, and strong, andthe fibrous material of their walls is practically homogeneous, no laminated or plied structure being detectable therein. Due to the widespread use of the laminated paper cores in certain industries, the metal end pieces of the paper cores have become standardized to fit certain mandrels. As these metal tips were originally shaped to fit on the thick walls of the paper tubes, such end pieces would not fit the thinner walls of my improved fiber tube. Hence in order to make possible the use of the standard end pieces with my fiber tube, I have devised a filler to fit into the ends of the fiber tubes and to thicken the walls sufficiently to fit the standard metal end piece. As a result of my invention, I provide a fiber core which is as strong as, or stronger than, the laminated paper core of the same external diameter, is lighter in weight than the pa er core, and is fitted with standard metal en pieces.

For a better understanding of my invention, reference is had to the description thereof which follows and t1) the drawing of which, I

Figure 1 shows in perspective a fiber core embodying my invention.

Figure 2 is a perspective of one of the fillers to be inserted in an end of a fiber tube to make it fit a standard metal end piece.

Figure 3 is an elevation, partly in section,

of the end portion of my improved core.-

Referring to the drawing in detail, 10 rep-. resents a fiber tube of homogeneous fibrous material preferably made by winding a sheet of wet pulp fiber upon itself in convolutions under pressure to build 11 the requisite thickness of wall and externa diameter. Such a tube is thereupon dried in such a way as to maintain its true cylindrical shape and may thereafter be treated with' a sizing or saturant as desired. To increase the wall thickness at the ends of the tube to which standard metal clips 11 are to be attached, I insert a filler 12 which may comprise a short cylindrical member, preferably of the same material as the tube 10, and of asize to form a driving fit within the tube 10. The fillers 12 may be made on a tube machine in exactly the same manner in which the tubes 10 are made, the smaller tubes then being cut up into ap propriate lengths and if desired beveled as at 13 within one end thereof. If desired, the exterior surface of the fillers 12 may be coated with an adhesive prior to their insertion into the ends of tubes 10. After the fillers 12 are in place, the adjacent external end surfaces of the filler 12 and tube 10 may be madefiush and a cap or end piece ll fitted on as shown in Figure 3. These cap pieces ll-are preferably of standard size and shape and as usual are preferably secured in place as by turning the edges into the fiber as at 14. and 15. As will be seen, I have thus provided a superior fiber core which is of standard external diameter and which has standard metal ends so that it can, be used in place of the laminated paper core'which has hitherto been used, without necessitatingany change in size or shape of mandrels or other machine parts heretofore customarily used in connection with the paper cores.

.Having thus described a certain embodiment of my invention, it should be evident to those skilled in the art that variouschanges. and modifications may be made therein without departing from its spirit or scope as defined by the appended claims.

I claim 1. A fiber core comprising a relatively thinwalled fiber tube, a short tubular filler having an internal diameter substantially equal to that'of a standard paper core fitted within each end portion of said tube, and annular metal end pieces fitted on the ends of the com-. posite structure thus formed.

2. A fiber core comprising a relatively thinthe wall thickness of a standard paper tube walled tube having substantially the same exand a metal end piece fitted-over each end of 10 ternal diameter as a standard paper core, the the tube and engaging the outer surface of the wall of said tube being of homogeneous intertube and the inner surface of the filler.

5 felted fibrous material, a short tubular filler In testimony whereof I have aifixed my of homogeneous fiber fitted within each end signature. 1 of said tube the combined thickness of the tube and filler being substantially equal to HOWARD PARmR. 

